Cartagena and Providencia - how long?
 

We are planning a trip to Colombia in August. Hopefully the weather is good.

Idea - Cartagena (3-4 days), Providencia (5 days)

I'm not sure how many days we need in Cartagena. We will save the beach time for Providencia, or alternatively we are considering going to Park Tayrona.... It doesn't seem that the Rosario Islands hold a candle to Providencia. Any suggestions appreciated for a 10 day trip.